Match the vitamins in List-I with their sources in List-II. List-I: A. vitamin A, B. vitamin B₁₂, C. vitamin E, D. vitamin K. List-II: I. meat, II. sunflower oil, III. green leafy vegetables, IV. carrots.

Solution & Explanation

Concept: match each vitamin to its characteristic dietary source. A. Vitamin A — carrots are the classic source (β-carotene, the provitamin, is responsible for the orange colour) → IV. B. Vitamin B₁₂ — found almost exclusively in animal foods such as meat (it is essentially absent from plant foods) → I. C. Vitamin E — abundant in vegetable oils such as sunflower oil → II. D. Vitamin K — rich in green leafy vegetables (spinach, etc.), important for blood clotting → III. So A-IV, B-I, C-II, D-III. Trap: do not swap vitamin E (oils) with vitamin K (green leafy vegetables), and remember B₁₂ is animal-sourced (meat), not plant-sourced. Hence the answer is B.